U0903 Mercedes E Class OBD Code

OBD/2 U0903 error code description and symptoms.

Engine Coolant Temperature (ECT) Circuit High Input Indicates the sensor signal is greater than Self-Test maximum. The ECT sensor maximum is 4.6 volts or -50 C (-58 F). Note on some vehicles that are not equipped with an ECT sensor, CHT can be used and can set this DTC. Open circuit in harness Sensor signal short to power Damaged PCM Improper harness connection Damaged sensor ECT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

U0903 Mercedes E Class Error Code Repair Process :

The scent may U0903 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such U0903, so if the inside of your car evaporative emission (evap) system flow during non-purge oldsmobile only as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Common Causes of Mercedes E Class U0903 OBD2 Code

A common cause of code U0903 is the failure of Evaporative Emission (EVAP) System Flow During Non-Purge Oldsmobile Only, but there are several other possible causes as well, such as ;

Engine Control Module (ECM)
Faulty Variable Camshaft Timing (VCT) position solenoid
Erratic camshaft position due to low oil pressure
Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection

U0903 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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U0903 Mercedes E Class OBD Code

U0903 Mercedes E Class Error Code Repair Process :

Common Causes of Mercedes E Class U0903 OBD2 Code

U0903 code for other Mercedes cars